SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '221ded848be59389afb40305d1211d395db869ebc1d8d6faa329f3c6c1cf1636' 
  AND token = 'dEuk4zSPl97YKZXaRBPX2Q1ikVi/OwZ/J37GUmKyZ5M=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00055

JSON explain

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