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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '44931fd3b82fbb3f09fee2ade6ab655c9c2021e98c282d43603da8d78eea3d3e' 
  AND token = '17SRQ1gaJzuDF4XjH+nhikzra0CKXF6UtM9EwoXUdxM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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