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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b7662451beeba55a4feea8fc298feb946e29252569e632cfd873707c212eb4db' 
  AND token = 'XlU/QB3FWhCR+wr6ioooSB5nJTL05ulLwYZRxo4kylc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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