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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a7e4c738b9843867b76a46263979c0a4997816753e8ec3869c8130ca3fd81544' 
  AND token = 'vcuiqQSpsSd03kzt56SpMPsC+lmo/HDiggRCJC5QWcE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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