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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '15ba03c9b8c2db9232e80ac28aebfe8e9a215a6fa75e1cf11f8ec7a8cbeebcf2' 
  AND token = '4NOUHINPBqBrsgg04YWs+zwQelwuwfa9CNpnMEZQTpE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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