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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '90e403c89b256b8430fed35badb9b6de608c4227f0c1d0b4fcc6a8a2a28bd0aa' 
  AND token = 'uxZo9gye4C4MJD6qqVvw2tnmkz4SGVcH8d+lQMNwf2s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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