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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e44ac18dc715aec860a6690b742c39e9d470691b60d0e472557d400138a4e987' 
  AND token = 'X3dQsnMMJKbFlKuBAFc9ZlUgSMs7jA/yNcD3jtam9bg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00056

JSON explain

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