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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ade9559c102e8e4d3830f512d0477138065ee5f8797c7c78ae183cde2215a973' 
  AND token = 'wT2DfVwmmBUQRjO/HEep5gW5Kz/PVRIc6U0PYT7FYls=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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