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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b08890d0e18e7ae3557e0579b4f240a5071800dc9e270d6aeeb23011b781a5d9' 
  AND token = '5YS8BMtjlcDo3GBMZSfHcNfHysGugjzBcEMb6oRX+a0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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