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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e7fe0a36984a81ec6d643b301dc6204bb15c398687c6d82ccb172beef0ca2907' 
  AND token = 'I12hFJP+CU9IFKQ3Xv8ESIE1lJ2LIfptBqR7/GXmqb8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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