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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'be2644fb0e74067b596ce8722d359e47a6c44a134f6ed0e6bba8bb4b970b07cd' 
  AND token = 'G5nL8eKeNnfKAWky7cZ551oGFqlra9Y1EoYFJQzBQLs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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