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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '193ed53bf397db213bcb3187c71233c6f1cee20936436487bd22ec8568dd8b19' 
  AND token = 'Bedj9gkmmMXIAc/Ntr/7YYRlnTL7x6pw5dKwRSMl8JI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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