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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '552546d66344779563f9288f715067a566bfb1a08869b809207b6c1427eab648' 
  AND token = 'uXCsX0xMy/6nZckV/C1QXVWHvRD8I0le2/k6wOXqY5k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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