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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '56eac11cfabe5c602b0fbbf4335f039d9ef3c9f450ca0597922c7838de0ee637' 
  AND token = 'nPUDAOrj5ogz/TT4Tw//aEzBYmYxHD/y+ntgF11sR30=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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