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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cb930b283daec6a419f2e9970f544b6f5d27ed5cc53cbf030a02e70f7b707b75' 
  AND token = 'eF43TzeIseWysWfvKAoDRQjM+BKOoba+EP0tBmSExe8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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