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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fb77b3b26e1bc880b1b3ecf8bcd5a53ee12fd6d6778101d313e7fc8eac8d2fc2' 
  AND token = 'Rjn5GUZ+2eoEL62kegkUSzsQ1rN062m40PbDVIBTv2Q=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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