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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '308bc938468c3ae8459e60c091c77ae6b969d92298b5d0ece3828ce6273683af' 
  AND token = 'uFZP07QcOc53yaNn4mkCOs3CqdF8H5W0gU30Rbs6SLE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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