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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0cfd2025c9e5492238cc10c59207c9aecfc66ec9b298f109b64eef8c0e3519e9' 
  AND token = 'Pd9lqNrkxQWuKOeP3KDcqZgWASyQ7pQjFNGo15JqwYg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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