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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7f32c16633c268760d2f14e442a9980ee2d04e2dda9bd1b49cfbd1c4b9b67bdc' 
  AND token = 'xn8LMvJeZ+FAM7je0DA+q6au27XhPbEKGSxFi0JmyTI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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