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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '802011dd6ab3b8c3e6b297a66f4233d05636b99547b94fa518810c0584fa822a' 
  AND token = 'xLvGrqFLA0URi10nPsSY2dTAZhTEkhQtu+6MCxkJGeM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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