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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '39070bbbe85d4e4c02dcfcfd516b85ea97702beb52125c217bb49bb947fbc5a4' 
  AND token = 'LDt7Vr/eAx0qqA/yIsBYmvGmTgVFQMCIV1V2yoO3Lck=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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