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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ecd248e679496eeb1dd3c5b444031d59b992fec313ea44397fe13d37c31b0736' 
  AND token = '11SfQkmpglS9ItUP/E//m9PgMjt0+TNfijO6sjf56+g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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