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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '09b8d8cc4e9cd52fe7b63baf9ea5136b66ae7f2c22afd42c1434f4318895b73e' 
  AND token = 'S8pFw4g5ekQ1/e6FTraGKRAIkEjMiiAgoVHPzMTfvxM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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