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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e16fcb5b8df7cf63bfe8c5dab19674ca2efcb65f4211b6d37904f7b892c2db0f' 
  AND token = 'e7MkVgZUBGkTyYmIK9McLpgGo9gACoCxghrTpqDl5Cc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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