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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '81022eaba9401a739724b6c8ca59685375d032913e758c04bf133ff57b5779d1' 
  AND token = 'gM87dOlRUX8B6b+gp6H9doZg4LWI5vBtyZaPN/0iHGU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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