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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0aa31da2dc8f049d633fa3fd0f08f0e4d1c27babad886ebe18a1ac9e9dea05ec' 
  AND token = '4mjoPUK2F01sumDiACSBXT6iUHr41FjckeXsRIAhJLY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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