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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7ffb2091e30aa6e7cf046dd86ba76c178547a3aa6cd61fc55b01038bd701039a' 
  AND token = 'YJR6fBGrzbggKVmovNi65ZPboxiDgyy7JYHqEK877tM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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