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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0dbd1e79dd8198d71fa96f2cca48b7053071005ee86a70a747e14c8d72e2c729' 
  AND token = 'Ihdt5SDl2gPVod38jbrYpO/WmzAmFaze70Irr6zhjy4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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