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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8aa91f3a5a2e601f6948deccb40ce24cf3c7bf0e13d078ff1b76e2283d4365d4' 
  AND token = 'EdtzsZCJV9Wt5W6OvilfmMBGzbARdeXIuhcSDi5RXc4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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