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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '738c9345dd8cbcf5b276a1c37d673b7c935d87dab6c9931a784d0dfec91e97d7' 
  AND token = 'UiAZNC4aKI5qRSbPctCiWLRNc3xvxMstC3qG+x3z8eQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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