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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e2185b24deac78f7721f832b0a5348c519d572bc739d84317ba0cdf2c8367bb5' 
  AND token = 'mhJ2jmGsq12Q97UEgJaW0RpI/wPezb8ZDDR9kCPPRhA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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