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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7a355815461ab0001a02b32b159eb64254fc94da8aa32f6e306f0cdf44c6a87a' 
  AND token = 'l0N4SSL5bNSOubRFv8nPKo+COAH+mdwwsEXFQymt+t0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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