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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '182a72099871456eb55f1e00a67e0cf754d516b486e4cdba4e636992e094ac4b' 
  AND token = 'mCxbLMHhC58u/8g1TA2no1LkmU4roL6DUnQBDQRh4bQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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