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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6e4975e3b1e8ae18cc5b2f4561805216a531e2bf52b32eb14c906db3ab5d09c7' 
  AND token = '0InlQkqxi61c0M5LkjDtg1dbYdMKwgJrw0HQDW2ukqM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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