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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '316b0210f8755085a8f1766758b8a99cfdc749cea96613a9e9497fa5982dfde9' 
  AND token = 'kfzvabvDBLYD84d4OlOs3BkkoBpJIVjZvO5k4fx1Jrc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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