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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bb94540970939977e0650c07958ef3f6af8a5c3c750b81800febecd116d34d96' 
  AND token = 'kFv/PyqiBkaT4dD0pGVfJtROXDZ2E1ZRN+bkTfMKM5Y=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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