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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '66aa85ccea1f75791d983c45e45da5a47ca6db696f791819de43ef5db35642ba' 
  AND token = '08Hazx4EelK6TdPbklf21xbCIloJbMahVFwrNhf+56c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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