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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b4db5ae0d7728f9eaffa909ab3976859950017dcb62743d8c245357f9a4fb5ec' 
  AND token = 'R2HCZ6cyS2Uk0deusHXevbvsYnSRxqdIfBo06m0MhX4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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