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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'edfa9f398c3fea6e909a99c747ced14c58510b1bde4d592c5e8def22893e3869' 
  AND token = 'nDHbK8eX9DyzKjlxJDQj/TdML4PcsdlTF+YP7npeKJk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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