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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '097c56b23ee62a03d8595ab26d05048a0ffa13172b582814c91eb5f426c98c9e' 
  AND token = '6S2KK2iruBccb9N8KEQZPTtvqJNxQSaEyrWQ53HDCM8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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