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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bb8723d63d0f90baab2f2e68936fd4228072fdb1d306a37dc40cd99968fad919' 
  AND token = 'PkX8FQXmgX392At9n9Pp9FdJ99xnW9fTS7UNQDLU6Qs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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