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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4d84feb73a5c124b104a7ce4d46883f0eaecbd7ae03d45da322f514f991d7be6' 
  AND token = 'N0v03nbVVAZx54F5RbykH0moZNrAcxliF61099SiSvw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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