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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'dfdea3c45b101af6b54c1ed11b831e2710eb53899d69a767c2108f71737e780e' 
  AND token = 'C4Hh/bKWv7hveexhbKcPqe48qQjEEwrCTQCqPU7Xphw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00074

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}