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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '672db8ecd70df547e68014c8a6c0fd40e399e9d4a371a1de92d1e1ffb3b4ef84' 
  AND token = 'OOe6FqrBrFIj5y6eH/WpfTkmBM/kaaEU4IMzkG8C4H8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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