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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '508e0db2229aad31d5f90bc9d93e583a20101761ee72fd7be48a7797f893da59' 
  AND token = 'b3r1h+U78uL86z3qhbwG6xNPP/4XalxSLTLwdaJkN/k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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