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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c1d7a72660857b8825ad0411a1fd67f13ddf263af9fad5965e076996681f3873' 
  AND token = 'm6dILLhzGNbeMandBFef5n8aUD0hbUtrvG6tz6Xex1I=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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