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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '37866c75b2ae380f86f673f74fa76503a2a737f7a484fd93b67e9bffcd712e1c' 
  AND token = 'EHcb6UCZ4dYgMNKKwigY9t/MDXNyj+Rk905ELvCQ6lI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00076

JSON explain

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