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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '875ea730010ce81c783b584d7fd11476345936b315e187c0954cb6e1f9b6e027' 
  AND token = 'vJRO5YCVW12SEHhAdMddylYSQJaV+8tETf7PI1nPf0U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00047

JSON explain

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