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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '55c7bf592cec69b94c0df08c7aeab9574957be9c5469d4a4f1da7582d0805cb6' 
  AND token = '+kyXRyW8TNh4lyCrNVEeP6YIcbxU6uxIom13bjtIr4U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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