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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '57717eff7184d7a9c85ed8ffe00398b840107aa1ec7ae14efc84e69adea184a6' 
  AND token = 'B9oES7i2bqQ6n3w1XvD/xRFClY4jONSQtkSkf0iaCak=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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