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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '26414b826fc955d5100f87a425b96fa06b75a36d8d1a82f778925aba17965885' 
  AND token = 'pfXuCba90mYdmPrf2sF/fM4JUMzSGLVro5A1wq4PfwU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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