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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7259c7eed79f432ae0897259a98c5c859f745669f5c54760305dcdd0720e1859' 
  AND token = 'jZYt0HuW/L4r4JVScRCamjas6xgvh/T79Y8QbZECy0E=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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