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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b4457f775753f3dbef64cf96a9138460bf43b5abda0b20b8b159b2f96d463281' 
  AND token = 'OCwlrZ49TnlbqUbNoAP6sv4n7mzr9umjbYYabXPq/bU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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