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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b428058025029abf9a4606408136943214e9f82cc4f991b27a9dd5dc8c05822f' 
  AND token = '2kjZWtBi8NljNJcIakVgr1S0MDwNy8oQDeC7EY8V8i4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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