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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '92b7755479676b09636e4f5b9548746d4abb1961145def26f61f927200b1c120' 
  AND token = 'wCAWGa70JBCep65O1ZKrG50jIlqpopGBTWnA6CnVF4A=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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