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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c7d6081c2436caa8df64e4e68c4cea9637d2d0bb23e815a93f08a51f9ca3bfb2' 
  AND token = '54jRIy1SmelgyMWmQb45LzuGkWfGvVVcvArzq9GGoZg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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