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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '20a63ff6002e5eb42b7ed1317ec07156f96e98004c7e2e7560b16ba1350f230c' 
  AND token = '/2cZFyEtRwhY595zkZyg58wQjf+7bFdZCriUwZmORAY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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