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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '10b7825d4f943d56931b7ccc0c2b367c16077f668e1131707d06bb8f5aff1efc' 
  AND token = 'pXlcVdhULyPZef1bDdXm7ANwPVdWWzgJoXghbKtt2Wo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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