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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7917f9b2677a3ce2f30bd34cf9f5dde6d273abeedf2922db2ecfe75e570c24e7' 
  AND token = 'Fg670YP8wc5XoyJcHIIG2KGlc26KKvcGvV6ZpCQvE3o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00053

JSON explain

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