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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cad4e2d9fdfa5913898a15fcb571acce53bc015f2828b8834bfe64d994b0e03c' 
  AND token = 'V7Ojkijm+M8FVt7Y5onPJlxd5obidM9DbU2kFBAP2jw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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