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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b26479d5af2255f1e53971676909795d1a3dd078b6869bad1892975c7ccb3bc2' 
  AND token = '1sSM17qOXl+mz3nry0azVVgZWh9QBRy7Ml96caXrU0Y=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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